小编Bom*_*ber的帖子

当我登录用户并使用标题重定向时,我的会话变量为空.

/* Login page */
session_register("myusername");
session_register("mypassword");

$_SESSION['myusername'] = $_POST['myusername'];

header("location:page.php");

/* page.php */

<?php echo $_SESSION[myusername]; ?>

我正在尝试为我的选择列表创建一个选项:

getMarkOptions: function () {
    var options = this.props.renderProps;

    return options.map(function (mark, i) {
        return <option
            key={i}
            value={mark}>
            {mark}
        </option>
    });
},


render: function () {

    console.log('mark editor ' + this.props);

    var selectedMark = this.props.value,
        row = this.props.data,
        highlightCurrentDay = this.props.highlight ? 'edit-select__currentDay':'';
        return (            
            <select
                value={selectedMark}
                ref="selectMark"
                className={"edit-select form-control " + highlightCurrentDay}
                onChange={this.onChange}
            >
                {this.getMarkOptions()}
            </select>      
        );
}

数据:

var marks = [
        {"id": 1, "caption": "/", "code": "/", "meaning": "Present (AM)", "isStandardCode": true},
        {"id": 2, "caption": "\\", "code": …

我正在尝试将此组件与使用es5的异步选项一起使用。我的componentDidmount中有一个服务调用，该调用使用回调设置school数组：

componentDidMount: function(){

    SchoolsDataService.getSchools(
        this.setSchoolsState
    );

将学校列表设置为状态数组

setSchoolsState: function(data){

    this.setState({schools: data.schools})

},

服务：

getSchools: function (callback) {

    var url = 'xxxx';

    request
        .get(url)
        .set('Accept', 'application/json')
        .end(function (err, res) {
            if (res.ok) {
                var data = res.body;
                if (data) {
                    callback(data);
                }
            }
        });
}

如何使用文档中的示例进行设置？我在哪里将这样的异步版本的服务调用放在哪里并生成选项列表？

var getOptions = function(input, callback) {
setTimeout(function() {
    callback(null, {
        options: [
            { value: 'one', label: 'One' },
            { value: 'two', label: 'Two' }
        ],
        // CAREFUL! Only set this to true when …

任何想法这个错误是什么意思？

当我尝试运行时，npm run playground-android出现错误。

失败：构建失败，发生异常。出了什么问题：任务'：app：processDebugResources'的执行失败。java.io.IOException：无法删除路径'C：\ sites \ ReactMatt \ lower-drinking \ android \ app \ build \ Generated \ source \ r \ debug \ org \ webkit'。

有任何想法吗？

我试图在下面的减速器中更新状态。

结果对象具有两个数组：

results: {
    correctAnswers: [7]
    incorrectAnswers: (9) [0, 1, 2, 3, 4, 5, 6, 8, 9]
}

如何添加totalScore到结果对象？下面的代码添加totalScore，但删除correctAnswers和incorrectAnswers。

case "COMPLETE_QUIZ": {
  const { totalScore, id } = action.data;
  console.log(action.data, state);
  return {
    videos: state.videos.map(video =>
      video.id === id
        ? {
            ...video,
            results: {
              totalScore \\ add here
            },
            completed: true
          }
        : video
    ),
    search: { term: "", videos: [] }
  };
}

我试图打开一个模态并用状态数据填充它.

根据我的理解,除了使用bind(this)之外,是否可以构造此方法？回调可以作为一种选择吗？

showExclusionDialog: function(){

    if(!this.state.exclusionReasons) {
        if(!this.state.exclusionReasons) {
            ExclusionLookupService.getReasons(function(reasons){
                this.setState({exclusionReasons: reasons});
            }.bind(this));
        }
    }

    if(!this.state.exclusionTypes) {
        ExclusionLookupService.getTypes(function(types){
            this.setState({exclusionTypes: types});
        }.bind(this));
    }

    if(!this.state.exclusionSessions) {
        ExclusionLookupService.getSessions(function(sessions){
            this.setState({exclusionSessions: sessions});
        }.bind(this));
    }

    this.setState({exclusionDialogShow: true});

},

I get the above error when I try and send messages to devices:

let functions = require("firebase-functions");
const admin = require("firebase-admin");

var serviceAccount = require("./configs.json");

admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    databaseURL: "https://pushmessage-bd1eb.firebaseio.com"
});

const db = admin.firestore();
exports.getUsers = functions.https.onRequest(async (req, res) => {
    db.collection("users")
        .get()
        .then(snapshot => {
            const messaging = admin.messaging();
            let registrationTokens = [];
            snapshot.forEach(doc => {
                let id = doc.id;

                registrationTokens.push(id);
            });
            console.log(registrationTokens);

            // process the tokens
            const message = {
                data: { title: "Testing", body: "Test" }, …